Production of alkali metal carbonates in a membrane cell
US4080270A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jul 21, 1976 |
| Grant date | Mar 21, 1978 |
| Priority date | — |
| Expiry date | Jul 21, 1996 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC25B1/14
- WIPO fieldSurface technology, coating
- WIPO sectorChemistry
Abstract
An alkali metal carbonate substantially free of alkali metal chloride is efficiently produced by electrolyzing an alkali metal chloride in an electrolytic cell having anolyte and catholyte compartments separated by a cation-exchange hydraulically impermeable membrane comprised of a thin film of a fluorinated polymer having pendant sulfononate groups and a cathode spaced apart from the membrane, injecting into the catholyte compartment of the cell carbon dioxide in a quantity sufficient to convert substantially all of the alkali metal hydroxide forming therein to the alkali metal carbonate salt, and utilizing a magnitude of electrolyzing current that reduces alkali metal chloride in the carbonate salt to less than 400 ppm.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.